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2D TRANSIENT NATURAL CONVECTION GENERATED BY ISOTHERMAL ACTIVE WALLS IN PARALLELOGRAMMIC ENCLOSURES

DOI: 10.1615/ICHMT.2008.CHT.1970
11 pages

A. Bairi
University of Paris 10, GTE-TIE, 50, rue de Sèvres, F-92410 Ville d'Avray, France

N. Nguyen
University of Paris 10, GTE-TIE, 50, rue de Sèvres, F-92410 Ville d'Avray, France

I. Bairi
Ecole Nationale des Ponts et Chaussées, 6 et 8 avenue Blaise Pascal Champs-sur-Marne, F-77455 Marne la Vallée Cedex 2, France

Najib Laraqi
University of Paris 10, GTE-TIE, 50, rue de Sèvres, F-92410 Ville d'Avray, France

J.M. Garcia de Maria
Universidad Politécnica de Madrid, Department of Applied Physics, Ronda de Valencia, 3, E-28012 Madrid, Spain

N. Alilat
University of Paris 10, GTE-TIE, 50, rue de Sèvres, F-92410 Ville d'Avray, France

Abstrakt

The present work deals with the 2D transient natural convection flows occurring in air-filled closed parallelogrammic cavities. Such cavities consists of four adiabatic walls forming a square cross-section duct (channel) closed by two vertical isothermal walls. The distance between these active vertical walls is L, both have the same height H and are maintained at temperatures Th and Tc respectively. The top and bottom passive walls of the channel are inclined at an angle a respect to the horizontal. This angle can be either negative (hot wall above the cold wall) or positive (hot wall below the cold one). Convective heat transfer is weakened in configurations with negative angles and favoured in those with positive ones. This type of cavities can be useful in several engineering fields. In the present study, it is applied to the thermal regulation of electronic devices. We consider an aspect ratio A=L/H=1.0, a temperature difference ΔT=ThTc=15°C and several inclination angles α varing between −60° and +60°. The main objective of the present work is to examine the temporal evolution of the maximum values of temperature, velocity and local Nusselt number in order to assure a correct operation of the electronic device. The numerical simulation carried out through the finite volumes method provides the convective thermal and dynamical fields. These distributions are presented at several representative times for diverse geometric configurations. The numerical analysis is complemented with some experimental measurements.

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